Tunnel milling and excavation in medium-hard strata and supporting mechanized construction method

Abstract

The invention discloses a medium ground tunnel milling excavating and mating mechanized construction method. The construction method includes the steps that the center of an upper step is excavated by a large breaking hammer to be in a paraboloid shape, after the outer portion of the center of the upper step is excavated and trimmed by a milling excavator to form an excavation face perpendicular to the tunnel axis, the upper step is supported to form a stable bearing arch, then the core soil part of a middle step is excavated by the large breaking hammer until a drill rod of the large breaking hammer is drifted, the edge wall parts on the left side and the right side of the middle step are excavated and trimmed by the milling excavator, initial supporting is carried out, the core soil part of a lower step is excavated by the large breaking hammer, the edge wall parts on the left side and the right side of the lower step are excavated and trimmed by the milling excavator, initial supporting is carried out, deslagging is carried out, and the steps are repeated until excavation of a whole tunnel is completed. By means of the medium ground tunnel milling excavating and mating mechanized construction method, the advantages of mating mechanized construction of the milling excavator are sufficiently exerted, accurate molding of the tunnel profile is achieved, surrounding rock is small in disturbance, back break control is good, the working environment is good, the construction safety is high, and influences of vibration of blasting are avoided.

Description

technical field [0001] The invention relates to a tunnel milling and excavating and supporting mechanized construction method for medium-hard ground, and belongs to the technical field of tunnel construction methods. Background technique [0002] At present, the tunnel excavation construction is mainly based on the principle of the New Austrian Method, and the excavation methods are divided into two types: drill-and-blast method and non-drill-and-blast method. With the rapid expansion of the scope of tunnel construction, it is inevitable that it will pass through existing roads, tunnels and various structures under it at close range. If the blasting vibration is not properly controlled during drilling and blasting construction, it will cause excessive deformation of the surface buildings and vibration damage. , or even collapse; at the same time, with the improvement of social safety awareness, the restrictions on the use of pyrotechnics in the engineering field will gradual...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a tunnel milling and supporting mechanized construction method in medium-hard stratum, so as to solve the problem that blasting construction cannot be used in the construction of medium-hard stratum tunnels or the surrounding rock construction with relatively large rock mass strength and good integrity Large blasting disturbance, serious over-excavation, and serious surface deformation caused technical problems

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